Gas and coal burning furnace.



C. R. STEDMAN.

' GAS AND GOALy BURNING FURNAGE. APPLIGATNN FILED' PBEM, 1907. 1,11 Sgf Y Patentedot. 18, NH4.

2 SHEETS'YSHRET'I,

O A J Y G. R.. STBDMAN. GAS NND ooAL BURNING NNRNAGN.

APPLIGATIQN FILED PEB.]4,1907.

Patented 0G15. 13, 1914.

l l l 5 5 .Ewen/4r: cwi@ 2z: am@

CHARLES B.. STEDMAN, 0F CLEVELAND, OHIO.

2.5 GAS ANB COAL BURNING FURNACE.

Specicaton of Lettersfatent.

ententes oct. is, i914.

Applica-tion filed February 14, 1907. Sera1No.357,250.

To all whom t may concern.'

Be it knoivn that l, CHARLES l. STEDMAN, citizen of the United States, residing at Cleveland. in the county of Cuyahoga and State of Ohio, have invented certain neu` and useful Improvements Burning Furnaces, of which the following is a specification.

My invention relates to furnaces -foi` burning gaseous or solid vfuel either in combination or separately: lts object is primarily topprovide convenient, inexpensive and efl'eo tive means for accomplishing complete coinbustion of fuel Within the nre spaces of a furnace, stove, steam boiler,ivater heater', or other fuel burning device to which it can be applied.

Further objects are to provide gas burning features which may be readily applied or removed from a fire space designed to burn solid fuel, to provide more permanent constructions, and to. provide for the proper feeding and disposition of solid fuel in con nection with the burning arrangement.

To these ends my invention consists in the 'features and combinations hereinafter described and claimed, embodiments and applications thereof being illustrated in the accompanying drawings in vwhich Figure l is a sectional elevation showing the gas burning device as removably applied -to an ordinary coal burning furnace. Fig. Il is a sectional elevation of an installation of the gas burning device in a furnace adapted thereto. F ig. lll is a longitudinal section of the gas burning retort. Fig. lV is an elevation of the tire end, and Fig. V is an elevation of the front or feeding end of Fig. lll. Figs. Vl and Vil are. sectional elevations of constructions and installations for large furnaces. 'The rete-rence le tor;7 retort linin` a indicates a refraci'ig a shell of lire-brick, lire-clay, or otl re resisting material, ferably, thougl not necessarily, of a sublly rectangulaieross section and open perforated end piece, or

at both ends. brick, o of similar material. and of a contour corresponding to the outside of the lining a is litted against the of the latter, and said lining and end piece are held in a metallic shell or casing c, preferably of steel, having overlapping ears-2d, or other suitable means, for holding e end piece in place against the lining o'. The other end of the retort or more properly, intensifying chamin Gas and Coal ITchiite, but some additional chamber, as shown. yTwo for the insertion of gaseous fuel pipes fz..l

The aperture f is made larger than the diameter of' its corresponding pipe 72., so as to admit suilicient air to accomplish complete combustion Within the retort o, and may if desired be arranged in spider form, as shown at i, Figs. Hl and V.

A mixer y' for gas and air of theusual, or any suitable formv is loosely fitted to the outer end of the pipe it, and held thereto by a set screw le. The mixer y' is operatively connected and secured to a gas l'supply pipe Z having a shut-od valve m. Thus, it will readily be seen that Whether or not the intensifying chamber is xedly secured to the fuel pipe iz., it can be easily and quickly attached or detached from the mixer j by manipulation of the set screw k.

In Fig. l, the gas burning retort or intensifying chamber is shown removably installed in an ordinary coal burning furnace, or stove, in which n is the grate, 0 is the lire chamber, ,o is the smoke pipe, and g is the usual feeding door. In this case the outer end of the retort rests upon the feeding support may be provided for t-lie re end, as shown at r. In other constructions the retort is supported upon the grate bars.

in Fig. Il, the tire chamber o and grate n .are long enoughlt'rom front to rear to roceive the retort or intensifying chamberand leave suflicient coal burning space s back lof f it. The front door g gives access to the retort, and a side door t opening into the space s is provided for feeding in coal, or other solidfuel.

In Fig. Vl, the coal burning space 5 is in .the forward portion of the tire chamber o, and adjacent to the front door f `through which in this oase the solid fuel is fed. An opening u is then made in the rear of the fire chamber for inserting the gas burning retort, and the plate o which closes the opening u may also take the place of the usual end 'plate e of the retort or intensifying gaseous fuel pipes la are shown in this case entering a single vis retort, and it is obvious that a plurality of retorts may beplaced in a `single fire chamber if desired. Perforations may be made through the shell of the retort, as shown at lw, when the conditions of the `installation re uire it. A

n large furnaces, such, for example, as 'are employedvfor boilers of great capacity, the gas burning retort or intensifying chamber may be built in of lire-brick, or similar material, forming one or more chambers as shown in Fi VII.v The rear wall of sai chamber is per orated, as shown at y, so that y the flaming gas'enters the coal burningspace s, asin the other arrangements. The bottom and sides of the intensifying chamber are made tight, and the coal burning space s and grate ln. are placed between the wally and a bridge Walla, beyond which is the usual combustlon chamber 2. A side door t similar to that shown in Fi II, is employed in this construction for eeding in coal or other solid hiel. smoke passagey p may be single or multiple, that it may be carried forward and back through the body 8 of a boiler or heater, or arran ed in any of thewell known ways for provi ing heating surface and draft. In the operation of the apparatus the mixture of combustible gas and air, having been ignited, burns in the vclosed retort or intensifying chamber, generating therein a degree of heat so intense that the ordinarily non-combustible elementszof the gas mixture are consumed. The liames, therefore, -which pass out through the perforations in the intensifying chamber are exceedingly hot, because all the elements of the gas mixture which are ca able of the production of heat through. com ustic-n have contributed to the evolution of heat, and substantially complete combustion ofthe mixture has occurred before the hot gases have approached or come iny contact with any relatively cold surface.v

And so if gaseous fuel alone is employed it is only necessary to provide sufficient heating surface about the fire chambers 0 and s, combustionchamber 2, and the iue p, to absorb and transmit the heat already enerated, in order to have effected a consi erable economy in the consum tion of gas. But when coal, or other solid uel, is burned in connection with gas, the economy of fuel becomes more ap arent, for the reason that the intensely hot ames issuin from the perforations of the intensif ing e amber give 0E much of their heat to t e burning coal, thus assisting the combustion of the latter. It is also evident that any smoke, soot and unconsumed roduc'ts which rise from the solid fuel lwil enter the intense heat ofy the gas flames and be utterly consumed. Substantially complete combustion of both the gase ous a nd solid fuel is thus obtained, and with It is obvious that the lire and will be o a low temperature, and substantially free from smoke.

Therefore, I point out and distinctly claim as my invention:

1. In a furnace, the combination with a fire chamber and flue suitable for burning solid fuel, of' anintensifying chamber located wholly within 'saidfire'flch'amher having perfor-ations through its inner end communicating with said fire chamber, means for supplyinol said intensifyin chamber with combustible gas, andA means or supplying said intensifying chamber with sufficient air to sustain combustion within said chamber. i

2. In" a furnace, the combination with a lire chamber .and flue suitablefor burning solid fuel'fofl a self-contained intensifying chamber located `wholly within and having perfora'tionsthrough its inner end communieatingr with said fire chamber, means for cientair to sustain'combu'stion Wit-hin said lntensifylng chamber, and means for revv-ire chamber.

` 3. In a furnace, the combination with a fire chamber and flue suitable for burning solid, fuel, of an intensifying chamber wholly within said fire chamber comprising a shell, a perforated end piece, a pipe 'projecting into said shell, means for supplying said'pipe with combustible gas, and means for supplying sufficient air to sustain ber. L

4. In a' furnace,'the combination with a fire chamber and ilue suitable for burning solid fuel, ofan.l intensifying chamber wholl within said lire chamber comprising a she and: a perforated end piece o fire resistin 'materiaha closureffor the other'end of sai shell, 'an ipejinserted'through said closure into 'said3 shell, means forsupplying said pipe'with combustible gas, and means for tion withinlsaid intensifyin chamber,

of a furnace for solid fuel, a self-contained gas burning intensifying chamber located rial, an outer casing, a closure for t e outer said closure into said lintensifying chamber,

gaseous lfuel and vair.

6. Incombination with' the fire chamber of/ a'furnace for solid fuel, a self-contained gas burning intensifyingA chamberk located ltherein comprising an inner shell and a perforated inner lend pieceof'refracto matesupplyinr said intensifying 4rchamber' withl combusti ilegas, means 'for supplying suiii combustion within said intensifying cham-v 5. In combination with t e fire chamber` end of said shell, a kpipe inserted throughthe fire spaces and flues the escaping gases Y moving ,said lintensifying chamber from said f nuo supplying suicient air to sustain combustherein/ comprising an inner shell and a per-f'. V forated inner end p iece of refracto unete#v and ymeans for supplying said pipe with I,

e5 sufficient heat absorbing surface adjacent to 'rial, an outer casing, a"closure for t e outer 180 end of said sheli, a pipe inserted through said closure into said inensying diamine?, and a mixer for admitting gas and ifemnvnaiy connewed with the outer SI1-ti of said pipe.

T. In combination with t`-e ''e chamber of n furnace for solid fusi, a sdf-contain@ gus blu-ning intensifying chamber located therein comprising an inner shel and a pei'- fm'ated inner end piece of refractory ma tel'iul, an eute casing, a Closure for the outer end of said intensifying Chamber fitted wit-hin said outer casing and against the end pe extend f a pi ing hzongn Sani ai A i; said mensizying member, auf; n supplying gase- @ns fuel Said pine.

g amv -4 Dd to l :im lny signature in the, piesence Subseribiilv Wi- Hesse@ n, Cie ibis 3h of 

